:root {
  /* Minimalist dark — Linear/Vercel inspired.
     Near-black surfaces, one accent (soft violet), monochrome text scale. */
  --red: #a78bfa;          /* single accent (primary, kept var name for min diff) */
  --red-dark: #8b5cf6;     /* accent hover */
  --red-light: #c4b5fd;    /* accent soft */
  --ink: #ededed;          /* primary text */
  --ink-2: #a1a1aa;        /* secondary text */
  --muted: #71717a;        /* tertiary / labels */
  --bg: #0a0a0a;           /* page */
  --bg-2: #000000;
  --card: #111111;         /* surface */
  --card-2: #171717;       /* elevated surface */
  --border: #1f1f1f;       /* default border */
  --border-2: #2a2a2a;     /* hover border */
  --good: #22c55e;         /* only on explicit correct state */
  --bad: #ef4444;          /* only on explicit wrong state */
  --accent: #a78bfa;       /* same as primary — one color only */
  --accent-2: #a78bfa;
  --accent-3: #a78bfa;
  --shadow: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.45;
}

a { color: var(--accent); }

.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  /* Two columns: brand is content-sized (auto) so the logo never compresses;
     nav gets the rest (minmax(0,1fr)) and its buttons wrap WITHIN that column
     when tight — they can't overlap the brand because it's a separate column. */
  display: grid !important;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  padding: 10px 18px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: var(--shadow);
  gap: 16px;
  min-height: 56px;
}
/* Brand never shrinks — the logo must always render at full size. The text
   block beside it (h1/sub) truncates / hides at narrow widths instead. */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  min-width: 0;
}
.brand > div { min-width: 0; overflow: hidden; }
.brand h1 { font-size: 1.05rem; margin: 0; letter-spacing: .2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brand .sub { margin: 2px 0 0; color: var(--muted); font-size: .8rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Subtitle goes first once viewport tightens — nav is the priority. */
@media (max-width: 1400px) { .brand .sub { display: none; } }
@media (max-width: 1200px) {
  .nav-btn { padding: 5px 10px; font-size: .82rem; }
  #nav { gap: 4px; }
}
@media (max-width: 1050px) { .brand h1 { font-size: 1rem; } }
@media (max-width: 900px) {
  .nav-btn { padding: 4px 8px; font-size: .78rem; }
}
@media (max-width: 760px)  { .brand h1 { display: none; } .topbar { padding: 10px 12px; gap: 8px; } }

.logo-link { display: inline-flex; text-decoration: none; border-radius: 10px; flex-shrink: 0; }
.logo-link:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
.logo {
  width: 36px; height: 36px;
  display: block;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(124, 58, 237, .28);
  transition: transform .15s ease;
}
.logo-link:hover .logo { transform: translateY(-1px); }

#nav {
  display: flex;
  align-items: center;
  gap: 6px 8px;
  flex: 1 1 auto;
  min-width: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
  /* Nav sits in the grid's auto column so it always gets its natural
     width. No overflow/scroll needed — if the viewport ever gets too
     tight, the brand column (minmax(0,1fr)) truncates with ellipsis
     first. Media queries below drop nav-btn font-size at narrow widths
     as a secondary defense. */
}
#nav > * { flex-shrink: 0; }

.nav-btn {
  border: 1px solid var(--border);
  background: var(--card-2);
  padding: 6px 12px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink-2);
  font-size: .86rem;
  white-space: nowrap;
}
.nav-btn:hover { border-color: var(--border-2); color: var(--ink); }
.nav-btn.active { background: var(--red); color: #fff; border-color: var(--red); }
.nav-btn.login { background: var(--red); color: #fff; border-color: var(--red); }
.nav-btn.login:hover { filter: brightness(1.1); }

/* Cluster switcher — the prominent "which DECA cluster" dropdown. */
.cluster-slot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 14%, var(--card));
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
}
.cluster-slot .cluster-ico { color: var(--accent); font-size: .7rem; line-height: 1; }
.cluster-slot select {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: none;
  color: var(--ink);
  font-size: .85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  padding-right: 16px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'><path d='M2 3.5L5 6.5L8 3.5' fill='none' stroke='%23a78bfa' stroke-width='1.5' stroke-linecap='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right center;
}
.cluster-slot select:focus { outline: none; }
.cluster-slot select option { background: var(--card); color: var(--ink); }
@media (max-width: 760px) { .cluster-slot { padding-left: 8px; } .cluster-slot select { font-size: .8rem; } }

.auth-slot {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 8px;
  margin-left: 2px;
  border-left: 1px solid var(--border);
}
.auth-slot.nologin { border-left: none; padding-left: 0; }
.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(167, 139, 250, 0.12);
  color: var(--accent);
  padding: 5px 10px;
  border-radius: 999px;
  font-weight: 700;
  font-size: .84rem;
  white-space: nowrap;
}
.user-chip .avatar {
  width: 22px; height: 22px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: .72rem;
  text-transform: uppercase;
}

main {
  max-width: 1100px;
  margin: 28px auto;
  padding: 0 20px;
}

/* ---- Home list ---- */
.home-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.home-head h2 { margin: 0; }
.home-head .hint { color: var(--muted); font-size: .9rem; }

.filter-row {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.filter-row input[type="search"] {
  flex: 1 1 280px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  background: #fff;
}
.filter-row input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11,61,145,.15);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow);
  transition: transform .08s ease, border-color .12s ease;
  cursor: pointer;
  position: relative;
}
.card:hover { border-color: var(--red); transform: translateY(-1px); }
.card.disabled { opacity: .55; cursor: not-allowed; }
.card.disabled:hover { border-color: var(--border); transform: none; }

.card .title {
  font-weight: 700;
  font-size: 1.05rem;
}
.card .meta {
  color: var(--muted);
  font-size: .85rem;
}
.card .badge {
  display: inline-block;
  align-self: flex-start;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .3px;
  padding: 3px 8px;
  border-radius: 6px;
  background: #eef3ff;
  color: var(--accent);
}
.card .badge.warn { background: #fff4e5; color: #9a5600; }
.card .card-stats {
  display: flex;
  gap: 10px;
  font-size: .82rem;
  color: var(--muted);
}
.card .pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: #f3f5f8;
  border-radius: 999px;
}
.card .pill.good { background: #e8f7ee; color: var(--good); }
.card .pill.bad { background: #fdecef; color: var(--bad); }

/* ---- Exam view ---- */
.exam-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
}
.exam-head h2 { margin: 0; }
.exam-head .actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink-2);
  font-size: .92rem;
}
.btn:hover { border-color: var(--ink-2); }
.btn.primary { background: var(--red); color: #fff; border-color: var(--red); }
.btn.primary:hover { background: var(--red-dark); border-color: var(--red-dark); }
.btn.ghost { background: transparent; }
.btn.small { padding: 5px 10px; font-size: .82rem; }
.btn.danger { color: var(--bad); border-color: #f3c6cd; }
.btn.danger:hover { background: #fdecef; }

.progress {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.progress .bar {
  flex: 1 1 200px;
  height: 8px;
  background: #eef0f4;
  border-radius: 999px;
  overflow: hidden;
}
.progress .bar > span {
  display: block;
  height: 100%;
  background: var(--red);
  width: 0%;
  transition: width .25s ease;
}
.progress .stats { font-size: .92rem; color: var(--muted); }
.progress .stats strong { color: var(--ink); }

.q-list { display: flex; flex-direction: column; gap: 14px; }

.q-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.q-card .q-num { color: var(--muted); font-weight: 700; font-size: .85rem; margin-bottom: 4px; }
.q-card .q-text { font-size: 1.02rem; margin-bottom: 12px; white-space: pre-wrap; }
.q-card .q-code {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .75rem;
  background: #f3f5f8;
  color: var(--ink-2);
  padding: 2px 8px;
  border-radius: 6px;
  margin-left: 8px;
}

.options { display: flex; flex-direction: column; gap: 8px; }
.opt {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  cursor: pointer;
  background: #fff;
  transition: border-color .12s ease, background .12s ease;
}
.opt:hover { border-color: var(--ink-2); }
.opt .letter {
  font-weight: 800;
  background: #eef0f4;
  color: var(--ink-2);
  min-width: 26px;
  height: 26px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-size: .85rem;
}
.opt .text { flex: 1; }

.opt.selected { border-color: var(--accent); background: #eef3ff; }
.opt.correct  { border-color: var(--good);   background: #e8f7ee; }
.opt.wrong    { border-color: var(--bad);    background: #fdecef; }
.opt.correct .letter { background: var(--good); color: #fff; }
.opt.wrong   .letter { background: var(--bad);  color: #fff; }

.q-card .explain {
  margin-top: 12px;
  padding: 10px 12px;
  background: #f5f7fb;
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: .92rem;
  color: var(--ink-2);
}
.q-card .explain strong { color: var(--ink); }
.q-card .sources {
  margin-top: 6px;
  font-size: .78rem;
  color: var(--muted);
}

.q-card .q-actions { margin-top: 10px; display: flex; gap: 8px; flex-wrap: wrap; }

.hidden { display: none !important; }

.empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
}

.score-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: var(--shadow);
  text-align: center;
  margin-bottom: 18px;
}
.score-card .score {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--red);
  line-height: 1;
}
.score-card .score small { font-size: 1.1rem; color: var(--muted); font-weight: 500; margin-left: 6px; }
.score-card .label { color: var(--muted); margin-top: 4px; }

/* ---- Modal ---- */
.modal { position: fixed; inset: 0; z-index: 100; }
.modal.hidden { display: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(12, 16, 22, .45);
}
.modal-box {
  position: relative;
  max-width: 460px;
  margin: 12vh auto 0;
  background: #fff;
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.modal-box h3 { margin: 0 0 6px; }
.modal-sub { margin: 0 0 14px; color: var(--muted); font-size: .9rem; }
.modal-sub code {
  background: #f3f5f8;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: .85rem;
}
.login-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.login-form input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}
.login-form input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11,61,145,.15);
}
.login-msg {
  min-height: 1.1em;
  margin-top: 10px;
  font-size: .85rem;
  font-weight: 600;
}
.login-msg.err { color: var(--bad); }
.login-msg.ok { color: var(--accent); }
.login-msg a { color: var(--accent); font-weight: 700; }
.login-links {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.linkbtn {
  background: none;
  border: 0;
  padding: 0;
  color: var(--accent);
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
}
.linkbtn:hover { text-decoration: underline; }
.known-users {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.known-users .chip {
  background: #eef3ff;
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
}
.known-users .chip:hover { background: #dde6ff; }
.modal-close { margin-top: 12px; }

/* ---- Stats page ---- */
.stats-head { margin-bottom: 14px; }
.stats-head h2 { margin: 0; }
.stats-head .hint { color: var(--muted); margin: 2px 0 0; font-size: .9rem; }

.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}
.kpi {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.kpi .k-label { color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .4px; }
.kpi .k-value { font-size: 1.6rem; font-weight: 800; margin-top: 4px; color: var(--ink); }
.kpi .k-sub { color: var(--muted); font-size: .85rem; }
.kpi.accent .k-value { color: var(--red); }
.kpi.good .k-value { color: var(--good); }

.panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.panel h3 { margin: 0 0 6px; }
.panel .panel-sub { margin: 0 0 14px; color: var(--muted); font-size: .9rem; }

.topics-table { width: 100%; border-collapse: collapse; }
.topics-table th, .topics-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  font-size: .92rem;
  vertical-align: top;
}
.topics-table th {
  color: var(--muted);
  font-weight: 600;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .4px;
}
.topics-table tr:last-child td { border-bottom: none; }
.topics-table .topic-bar {
  display: inline-block;
  height: 8px;
  background: var(--red);
  border-radius: 999px;
  margin-right: 8px;
  vertical-align: middle;
}
.topics-table td code {
  background: #f3f5f8;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: .82rem;
  margin-right: 4px;
  display: inline-block;
}
.topics-table .qlinks a {
  color: var(--accent);
  text-decoration: none;
  margin-right: 8px;
}
.topics-table .qlinks a:hover { text-decoration: underline; }

.paste-area {
  width: 100%;
  min-height: 110px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .95rem;
  resize: vertical;
}
.paste-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}
.paste-feedback {
  margin-top: 10px;
  font-size: .9rem;
  color: var(--muted);
}
.paste-feedback.err { color: var(--bad); }
.paste-feedback.ok { color: var(--good); }

.banner {
  background: #eef3ff;
  border: 1px solid #d0defc;
  color: var(--accent);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 14px;
  font-size: .92rem;
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

/* ---- Study tab ---- */
.study-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 820px) {
  .study-layout { grid-template-columns: 1fr; gap: 12px; }
}
.study-side {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 90px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
}
/* Mobile: kill the sticky pin so the topic list doesn't ride on top of
   the questions as the user scrolls. Also cap the topic-nav inside a
   short scroll region so 20+ topics don't push every question 5 screens
   below the fold. */
@media (max-width: 820px) {
  .study-side {
    position: static;
    top: auto;
    max-height: none;
    overflow: visible;
    padding: 10px 12px;
  }
  .study-side h3 { margin: 2px 0 8px; font-size: .95rem; }
  .study-side .topic-nav {
    max-height: 240px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-right: 4px;
  }
  .topic-nav .topic-link { font-size: .88rem; padding: 7px 9px; }
}
.study-side h3 { margin: 4px 0 10px; font-size: 1rem; }
.topic-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.topic-nav .topic-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: .92rem;
  text-align: left;
}
.topic-nav .topic-link:hover { background: #f5f7fb; }
.topic-nav .topic-link.active {
  background: #eef3ff;
  border-color: #d0defc;
  color: var(--accent);
  font-weight: 700;
}
.topic-nav .topic-link .wrong-badge {
  background: var(--red);
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 1px 7px;
  min-width: 20px;
  text-align: center;
}
.topic-nav .topic-link.active .wrong-badge { background: var(--red); }
.topic-nav .topic-link .code-chip {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #eef0f4;
  color: var(--ink-2);
  font-size: .72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
}

.study-main { display: flex; flex-direction: column; gap: 16px; }

.study-overview .kpi-row { margin-bottom: 0; }

.study-topic-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.study-topic-header h2 { margin: 0; }
.study-topic-header .code-chip {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #fdecef;
  color: var(--bad);
  padding: 3px 9px;
  border-radius: 6px;
  font-weight: 700;
  font-size: .85rem;
}

.sub-tabs {
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.sub-tabs button {
  background: transparent;
  border: 0;
  padding: 10px 14px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  font-size: .92rem;
}
.sub-tabs button:hover { color: var(--ink); }
.sub-tabs button.active {
  color: var(--red);
  border-bottom-color: var(--red);
}
.sub-tabs .count {
  display: inline-block;
  background: #eef0f4;
  color: var(--ink-2);
  margin-left: 6px;
  font-size: .75rem;
  padding: 1px 7px;
  border-radius: 999px;
  font-weight: 700;
}
.sub-tabs button.active .count { background: var(--red); color: #fff; }

/* Toolbar that sits above the "Review wrongs" question list */
/* Cross-cluster same-code practice toggle + divider. */
.cross-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 6px 0 14px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  font-size: .9rem;
  color: var(--ink-2);
  cursor: pointer;
  user-select: none;
}
.cross-toggle input { width: 15px; height: 15px; accent-color: var(--accent); cursor: pointer; }
.cross-toggle strong { color: var(--ink); }
.cross-divider {
  margin: 22px 0 12px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-2);
  font-size: .92rem;
  font-weight: 600;
  color: var(--accent);
}
.cross-divider .hint { font-weight: 400; }

.wrongs-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  margin: 10px 0 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(180deg, #fafaff 0%, #f3f2fb 100%);
  box-shadow: var(--shadow);
}
.wrongs-toolbar-label {
  color: var(--muted);
  font-size: .9rem;
  font-weight: 600;
}
.wrongs-toolbar .wrongs-reset-all {
  border-color: #fda4af;
  color: #9f1239;
  background: #fff;
}
.wrongs-toolbar .wrongs-reset-all:hover {
  background: #fff1f2;
  color: #881337;
}
/* Per-question reset button — small, muted, red hover */
.q-actions .q-reset {
  font-size: .85rem;
  padding: 4px 10px;
  color: #9f1239;
  border-color: #fecdd3;
  background: #fff;
}
.q-actions .q-reset:hover {
  background: #fff1f2;
  color: #881337;
  border-color: #fda4af;
}

.guide-body {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
  line-height: 1.6;
}
.guide-body h3 { margin: 0 0 6px; }
.guide-body h4 { margin: 18px 0 6px; color: var(--ink); font-size: 1rem; }
.guide-body p { margin: 0 0 10px; }
.guide-body ul { padding-left: 20px; margin: 6px 0 12px; }
.guide-body li { margin: 3px 0; }
.guide-body .key-terms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
  margin-top: 10px;
}
.guide-body .term {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  background: #f9fafc;
}
.guide-body .term strong { color: var(--ink); }
.guide-body .callout {
  background: #fff8e6;
  border-left: 3px solid #e4a100;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: .92rem;
  margin: 12px 0;
}
.guide-body .blueprint {
  display: inline-flex;
  gap: 12px;
  background: #f5f7fb;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: .85rem;
  color: var(--ink-2);
  margin-bottom: 10px;
}
.guide-body .blueprint strong { color: var(--red); }

/* =================================================================
   Welcome / intro page — cinematic full-screen hero
   ================================================================= */
body.welcome-active { overflow: hidden; }
body.welcome-active .topbar,
body.welcome-active main,
body.welcome-active .foot { display: none !important; }

.welcome-root {
  position: fixed;
  inset: 0;
  background: #0b0f1a;
  color: #fff;
  overflow: hidden;
  z-index: 50;
  font-family: inherit;
  perspective: 1500px;
}

/* Film grain overlay */
.welcome-root::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  opacity: .08;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  animation: grainDrift 1.4s steps(8) infinite;
}
@keyframes grainDrift {
  0%   { transform: translate(0,0); }
  25%  { transform: translate(-4%, -4%); }
  50%  { transform: translate(3%, -3%); }
  75%  { transform: translate(-2%, 3%); }
  100% { transform: translate(0,0); }
}

/* Grid overlay */
.welcome-grid {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-size: 60px 60px;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.04) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse at center, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 0%, transparent 72%);
  opacity: .55;
}

/* Spotlight radial */
.welcome-spotlight {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 50% at 50% 40%, rgba(124, 58, 237, .22), transparent 60%),
    radial-gradient(ellipse 80% 60% at 50% 100%, rgba(11, 61, 145, .25), transparent 70%);
}

.welcome-inner {
  position: relative;
  z-index: 10;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 20px;
}

.welcome-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: .82rem;
  color: #e6e9f0;
  letter-spacing: .6px;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 18px;
  opacity: 0;
  transform: translateY(12px);
  animation: welcomeFadeUp .9s cubic-bezier(.2,.8,.2,1) .2s forwards;
}
.welcome-eyebrow .dot {
  width: 8px; height: 8px;
  background: #a78bfa;
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(167,139,250,.9);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .5; transform: scale(.85); }
}

.welcome-title {
  font-size: clamp(2.2rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -.03em;
  margin: 0 0 8px;
  max-width: 11ch;
  opacity: 0;
  transform: translateY(30px) scale(.97);
  filter: blur(12px);
  animation: welcomeTitleIn 1.2s cubic-bezier(.2,.8,.2,1) .4s forwards;
  text-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.welcome-title .accent {
  background: linear-gradient(180deg, #fff 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  filter: drop-shadow(0 10px 20px rgba(255,255,255,.08));
}
.welcome-title .red {
  background: linear-gradient(180deg, #c4b5fd 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  filter: drop-shadow(0 10px 30px rgba(124,58,237,.45));
}
@keyframes welcomeTitleIn {
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.welcome-sub {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: #b9bfce;
  line-height: 1.55;
  max-width: 620px;
  margin: 16px auto 30px;
  opacity: 0;
  transform: translateY(16px);
  animation: welcomeFadeUp 1s cubic-bezier(.2,.8,.2,1) .9s forwards;
}
@keyframes welcomeFadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.welcome-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  opacity: 0;
  transform: translateY(16px);
  animation: welcomeFadeUp 1s cubic-bezier(.2,.8,.2,1) 1.15s forwards;
}
.welcome-btn {
  padding: 14px 28px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .1px;
  cursor: pointer;
  border: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform .2s ease, box-shadow .25s ease, background .2s ease;
}
.welcome-btn.primary {
  background: linear-gradient(180deg, #a78bfa 0%, #7c3aed 100%);
  color: #fff;
  box-shadow:
    0 10px 30px rgba(124,58,237,.45),
    inset 0 1px 0 rgba(255,255,255,.28),
    inset 0 -2px 0 rgba(55,17,115,.35);
}
.welcome-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow:
    0 18px 40px rgba(124,58,237,.55),
    inset 0 1px 0 rgba(255,255,255,.35),
    inset 0 -2px 0 rgba(55,17,115,.35);
}
.welcome-btn.secondary {
  background: rgba(255,255,255,.06);
  color: #fff;
  border: 1px solid rgba(255,255,255,.14);
  backdrop-filter: blur(12px);
}
.welcome-btn.secondary:hover {
  background: rgba(255,255,255,.12);
  transform: translateY(-2px);
}

.welcome-stats {
  display: flex;
  gap: 40px;
  margin-top: 50px;
  opacity: 0;
  animation: welcomeFadeUp 1s cubic-bezier(.2,.8,.2,1) 1.5s forwards;
  flex-wrap: wrap;
  justify-content: center;
}
.welcome-stat {
  text-align: center;
}
.welcome-stat .v {
  font-size: 1.9rem;
  font-weight: 800;
  background: linear-gradient(180deg, #fff 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.welcome-stat .l {
  font-size: .78rem;
  color: #8b93a7;
  text-transform: uppercase;
  letter-spacing: .15em;
  margin-top: 2px;
}

.welcome-skip {
  position: absolute;
  top: 22px;
  right: 24px;
  z-index: 20;
  background: transparent;
  border: 1px solid rgba(255,255,255,.14);
  color: #b9bfce;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: .85rem;
  opacity: 0;
  animation: welcomeFadeUp .6s ease 2s forwards;
}
.welcome-skip:hover {
  background: rgba(255,255,255,.08);
  color: #fff;
}

.welcome-scroll-hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 22px;
  text-align: center;
  color: #8b93a7;
  font-size: .78rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  opacity: 0;
  animation: welcomeFadeUp .6s ease 2.3s forwards;
  pointer-events: none;
}

/* Grade-at-end toggle + submit bar */
.mode-toggle-row {
  margin: 6px 0 12px;
}
.mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px 8px 10px;
  box-shadow: var(--shadow);
  cursor: pointer;
  user-select: none;
  max-width: 100%;
}
.mode-toggle input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.mode-toggle .slider {
  position: relative;
  width: 42px;
  height: 24px;
  background: #d7dbe2;
  border-radius: 999px;
  transition: background .15s ease;
  flex-shrink: 0;
}
.mode-toggle .slider::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px; height: 20px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
  transition: transform .15s ease;
}
.mode-toggle input:checked + .slider { background: var(--red); }
.mode-toggle input:checked + .slider::after { transform: translateX(18px); }
.mode-toggle .mode-label { display: flex; flex-direction: column; gap: 1px; }
.mode-toggle .mode-label strong { color: var(--ink); font-size: .95rem; }
.mode-toggle .mode-label .mode-desc { color: var(--muted); font-size: .82rem; }

.submit-bar {
  position: sticky;
  bottom: 0;
  margin: 20px -20px -20px;
  padding: 14px 22px;
  background: #fff;
  border-top: 1px solid var(--border);
  box-shadow: 0 -4px 14px rgba(0,0,0,.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  z-index: 5;
}
.submit-bar div { font-weight: 600; color: var(--ink-2); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--border); background: var(--red); }

.prev-picked {
  background: #fff4e5;
  border: 1px solid #f5d9a0;
  color: #6f4200;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: .85rem;
  margin: 0 0 10px;
  display: inline-block;
}
.prev-picked strong { color: var(--bad); font-weight: 700; }
/* After the user re-answers, tint the banner green for right / keep amber for wrong */
.prev-picked.good {
  background: #e7f8ec;
  border-color: #9ed7b1;
  color: #0f5132;
}
.prev-picked.good strong { color: #0f5132; }
.prev-picked.good .prev-picked-verdict { color: #0f5132; font-weight: 700; }
.prev-picked.bad {
  background: #fdecee;
  border-color: #f1b4bb;
  color: #842029;
}
.prev-picked.bad strong { color: #842029; }
.prev-picked.bad .prev-picked-verdict { color: #842029; font-weight: 600; }

.foot {
  padding: 26px 20px 40px;
  text-align: center;
  color: var(--muted);
  font-size: .82rem;
}
.login-privacy { margin: 12px 0 0; font-size: .76rem; color: var(--muted); text-align: center; }
.login-privacy a { color: var(--accent); }
.foot-sep { margin: 0 6px; opacity: .6; }
.foot-link { color: var(--accent); text-decoration: none; }
.foot-link:hover { text-decoration: underline; }

/* =========================================================
   MINIMALIST DARK — Linear/Vercel inspired
   Flat surfaces · one accent · thin borders · no glows
   ========================================================= */

html, body {
  background: var(--bg);
  color: var(--ink);
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}
body { min-height: 100vh; background: var(--bg); }

a { color: var(--red); text-decoration: none; }
a:hover { color: var(--ink); }

/* Top bar — dark-theme overrides. Don't reset display/flex here; the
   grid layout from the first .topbar rule must win. */
.topbar {
  background: rgba(10,10,10,.8);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: none;
}
.brand h1 { color: var(--ink); font-weight: 600; }
.brand .sub { color: var(--muted); }

/* Dark theme: keep the purple gradient logo as-is (no overrides). */

/* Nav pill (minimal chrome). Lives in the grid's flexible column; if its
   buttons don't fit they WRAP to another row inside the pill — never
   overflowing onto the brand/logo. */
#nav {
  padding: 3px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  flex-wrap: wrap;
  row-gap: 4px;
}
.nav-btn {
  border: none;
  background: transparent;
  padding: 6px 14px;
  border-radius: 6px;
  font-weight: 500;
  color: var(--ink-2);
  font-size: .9rem;
  transition: color .15s ease, background .15s ease;
}
.nav-btn:hover { color: var(--ink); background: var(--card-2); }
.nav-btn.active {
  background: var(--card-2);
  color: var(--ink);
  box-shadow: none;
}
.nav-btn.login {
  background: var(--ink);
  color: var(--bg);
  border: none;
}
.nav-btn.login:hover { background: #fff; color: #000; }

main { max-width: 1100px; }

/* ---- Home list ---- */
.home-head h2 { color: var(--ink); font-weight: 600; letter-spacing: -.01em; }
.home-head .hint { color: var(--muted); }

/* Exam list cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--ink);
  box-shadow: none;
  transition: border-color .15s ease, background .15s ease;
}
.card:hover {
  border-color: var(--border-2);
  background: var(--card-2);
  transform: none;
}
.card .title { color: var(--ink); font-weight: 500; }
.card .meta { color: var(--muted); font-size: .82rem; }
.card .badge {
  background: transparent;
  color: var(--ink-2);
  border: 1px solid var(--border-2);
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}
.card .badge.warn {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border-2);
}
.card .pill { background: var(--card-2); color: var(--ink-2); border: 1px solid var(--border); }
.card .pill.good { background: transparent; color: var(--good); border: 1px solid rgba(34,197,94,.3); }
.card .pill.bad { background: transparent; color: var(--bad); border: 1px solid rgba(239,68,68,.3); }

/* Info banners */
.notice, .info-banner, .login-prompt {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--ink-2);
}

/* Progress bar */
.progress {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: none;
}
.progress .stats { color: var(--muted); }
.progress .stats strong { color: var(--ink); }
.progress .bar { background: var(--border); border-radius: 999px; }
.progress .bar > span {
  background: var(--red);
  opacity: 1;
  box-shadow: none;
}

/* Question card */
.q-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--ink);
  box-shadow: none;
  transition: border-color .15s ease;
}
.q-card:hover { border-color: var(--border-2); box-shadow: none; }
.q-card .q-num {
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  font-size: .82rem;
}
.q-card .q-text { color: var(--ink); }
.q-card .q-code {
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--ink-2);
  font-weight: 500;
}

/* Answer options */
.opt {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  backdrop-filter: none;
  transition: border-color .12s ease, background .12s ease;
}
.opt:hover {
  border-color: var(--border-2);
  background: var(--card-2);
  transform: none;
}
.opt .letter {
  background: var(--card-2);
  color: var(--ink-2);
  border: 1px solid var(--border);
  min-width: 26px; height: 26px;
  border-radius: 6px;
  font-size: .82rem;
  font-weight: 500;
  box-shadow: none;
}

.opt.selected {
  border-color: var(--red);
  background: rgba(167,139,250,.06);
  box-shadow: none;
}
.opt.selected .letter {
  background: rgba(167,139,250,.15);
  color: var(--red);
  border-color: rgba(167,139,250,.35);
  box-shadow: none;
}
.opt.correct {
  border-color: rgba(34,197,94,.45);
  background: rgba(34,197,94,.06);
  box-shadow: none;
}
.opt.correct .letter {
  background: rgba(34,197,94,.12);
  color: var(--good);
  border-color: rgba(34,197,94,.35);
}
.opt.wrong {
  border-color: rgba(239,68,68,.45);
  background: rgba(239,68,68,.06);
  box-shadow: none;
}
.opt.wrong .letter {
  background: rgba(239,68,68,.12);
  color: var(--bad);
  border-color: rgba(239,68,68,.35);
}

.q-card .explain {
  background: var(--card-2);
  border-left: 2px solid var(--red);
  border-radius: 6px;
  color: var(--ink-2);
}
.q-card .explain strong { color: var(--ink); }
.q-card .sources { color: var(--muted); }

/* Buttons */
.btn {
  background: var(--card);
  border: 1px solid var(--border-2);
  color: var(--ink);
  border-radius: 6px;
  font-weight: 500;
  box-shadow: none;
  transition: background .15s ease, border-color .15s ease;
}
.btn:hover {
  background: var(--card-2);
  border-color: #3a3a3a;
  transform: none;
  color: var(--ink);
  box-shadow: none;
}
.btn.primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
  box-shadow: none;
}
.btn.primary:hover {
  background: #fff;
  color: #000;
  border-color: #fff;
  box-shadow: none;
}
.btn.ghost { background: transparent; }
.btn.danger {
  color: var(--bad);
  border-color: rgba(239,68,68,.35);
  background: transparent;
}
.btn.danger:hover { background: rgba(239,68,68,.08); border-color: var(--bad); }

/* Inputs */
.filter-row input[type="search"],
.login-form input {
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--border-2);
  border-radius: 8px;
  box-shadow: none;
}
.filter-row input[type="search"]::placeholder,
.login-form input::placeholder { color: var(--muted); }
.filter-row input[type="search"]:focus,
.login-form input:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 2px rgba(167,139,250,.15);
  outline: none;
}

/* Score card */
.score-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--ink);
  box-shadow: none;
}
.score-card .score {
  color: var(--ink);
  -webkit-text-fill-color: var(--ink);
  font-weight: 600;
}
.score-card .label { color: var(--muted); }
.score-card .score small { color: var(--muted); font-weight: 400; }

/* KPI cards */
.kpi {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--ink);
  box-shadow: none;
  transition: border-color .15s ease;
}
.kpi:hover { transform: none; border-color: var(--border-2); box-shadow: none; }
.kpi .k-label { color: var(--muted); font-size: .78rem; font-weight: 500; text-transform: uppercase; letter-spacing: .04em; }
.kpi .k-value { color: var(--ink); font-weight: 600; }
.kpi .k-sub { color: var(--muted); }
.kpi.accent { background: var(--card); border-color: var(--border); }
.kpi.accent .k-label { color: var(--red); }
.kpi.accent .k-value { color: var(--ink); }
.kpi.accent .k-sub { color: var(--muted); }
.kpi.good { background: var(--card); border-color: var(--border); }
.kpi.good .k-label { color: var(--good); }
.kpi.good .k-value { color: var(--ink); }
.kpi.good .k-sub { color: var(--muted); }

/* Panels */
.panel, .stats-head {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--ink);
  border-radius: 10px;
}

/* Study sidebar */
.study-side {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  box-shadow: none;
}
.topic-link {
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--ink-2);
  font-weight: 500;
  transition: background .12s ease, color .12s ease;
}
.topic-link:hover { background: var(--card-2); color: var(--ink); transform: none; }
.topic-link.active {
  background: var(--card-2) !important;
  color: var(--ink) !important;
  border: 1px solid transparent !important;
  border-left: 2px solid var(--red) !important;
  padding-left: 10px;
  box-shadow: none;
}
/* Kill pre-dark-theme base background (was #fff) + default transparent border. */
.topic-nav .topic-link { background: transparent; border-color: transparent; }
.topic-nav .topic-link:hover { background: var(--card-2); }
.topic-link.active .code-chip {
  background: transparent;
  color: var(--red);
  border: 1px solid rgba(167,139,250,.3);
}
.topic-link.active .wrong-badge {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border-2);
}
.code-chip {
  background: transparent;
  color: var(--ink-2);
  border: 1px solid var(--border-2);
  font-weight: 500;
}
.wrong-badge {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border-2);
  font-weight: 500;
}

/* Guide body */
.guide-body {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--ink);
  box-shadow: none;
}
.guide-body h2, .guide-body h4 { color: var(--ink); font-weight: 600; }
.guide-body h3 {
  color: var(--ink);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  font-weight: 600;
}
.guide-body p, .guide-body li { color: var(--ink-2); }
.guide-body .callout {
  background: var(--card-2);
  border-left: 2px solid var(--red);
  border-radius: 6px;
  color: var(--ink);
}
.guide-body .term {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--ink);
  transition: border-color .12s ease;
}
.guide-body .term:hover { transform: none; border-color: var(--border-2); box-shadow: none; }
.guide-body .blueprint {
  background: transparent;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  color: var(--ink-2);
}

/* Sub-tabs — simple underline */
.sub-tabs { position: relative; gap: 0; border-bottom: 1px solid var(--border); }
.sub-tabs button {
  position: relative;
  background: transparent;
  border: none;
  padding: 10px 16px;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  transition: color .12s ease;
}
.sub-tabs button::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transition: transform .15s ease;
}
.sub-tabs button:hover { color: var(--ink); }
.sub-tabs button.active { color: var(--ink); }
.sub-tabs button.active::after { transform: scaleX(1); box-shadow: none; }

/* Prev-picked badge */
.prev-picked {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--ink-2);
  font-size: .88rem;
}
.prev-picked strong { color: var(--ink); font-weight: 600; }

/* Mode toggle */
.mode-toggle {
  background: var(--card);
  backdrop-filter: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  color: var(--ink);
  box-shadow: none;
}

/* User chip */
.user-chip {
  background: var(--card);
  border: 1px solid var(--border-2);
  color: var(--ink);
  box-shadow: none;
  font-weight: 500;
}
.user-chip .avatar {
  background: var(--card-2);
  color: var(--ink);
  border: 1px solid var(--border-2);
  box-shadow: none;
}

/* Account dropdown (collapses Password/Switch/Log out so the bar stays 1 row) */
.user-menu { position: relative; display: inline-flex; }
.user-chip { cursor: pointer; gap: 7px; }
.user-chip:hover { background: var(--card-2); border-color: var(--accent); }
.user-caret { font-size: .65rem; color: var(--muted); }
.user-menu-pop {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 172px;
  background: var(--card);
  border: 1px solid var(--border-2);
  border-radius: 10px;
  box-shadow: 0 12px 32px rgba(0,0,0,.5);
  padding: 5px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.user-menu-pop.hidden { display: none; }
.user-menu-item {
  text-align: left;
  background: transparent;
  border: none;
  color: var(--ink);
  font-family: inherit;
  font-size: .88rem;
  padding: 9px 12px;
  border-radius: 7px;
  cursor: pointer;
  white-space: nowrap;
}
.user-menu-item:hover { background: var(--card-2); }
.user-menu-item.danger { color: var(--bad); }
.user-menu-item.danger:hover { background: color-mix(in srgb, var(--bad) 16%, var(--card)); }

/* Modal */
.modal-backdrop { background: rgba(0,0,0,.75); }
.modal-box {
  background: var(--card);
  border: 1px solid var(--border-2);
  color: var(--ink);
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0,0,0,.5);
}
.modal-sub { color: var(--muted); }
.modal-sub code { background: var(--card-2); color: var(--ink); border: 1px solid var(--border); }
.known-users .chip {
  background: var(--card-2);
  color: var(--ink-2);
  border: 1px solid var(--border-2);
}
.known-users .chip:hover { background: #202020; color: var(--ink); }

/* Auth slot separator */
.auth-slot { border-left: 1px solid var(--border); }

/* Generic */
.empty { color: var(--muted); }
.foot { color: var(--muted); border-top: 1px solid var(--border); }
.q-code { color: var(--ink-2); }

/* ================================================================
 *   NEW FEATURES (2026-04): mock test, completions, flashcards,
 *   daily streak. Minimalist dark — same language as base theme.
 * ================================================================ */

/* -------- Streak pill in topbar -------- */
#streak-slot { display: inline-flex; align-items: center; margin-right: 10px; }
.streak-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink-2);
  font-size: .82rem;
  line-height: 1;
  user-select: none;
}
.streak-pill.active {
  border-color: var(--accent);
  color: var(--ink);
  background: rgba(167, 139, 250, 0.08);
}
.streak-pill .streak-flame { font-size: .95em; }
.streak-pill .streak-num { font-weight: 700; color: var(--ink); }
.streak-pill .streak-label { color: var(--muted); }

/* -------- Home: mock button + mock banner -------- */
.home-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.home-head-actions { display: flex; gap: 10px; }

.mock-banner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  padding: 14px 18px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: rgba(167, 139, 250, 0.06);
  margin-bottom: 16px;
}
.mock-banner strong { color: var(--ink); }
.mock-banner .mock-sub { display: block; font-size: .82rem; color: var(--muted); margin-top: 2px; }

/* -------- Card completion ribbon + retake button -------- */
.card { position: relative; }
.card.completed { border-color: var(--border-2); }
.card.completed .title { color: var(--ink-2); }
.done-ribbon {
  position: absolute; top: 10px; right: 10px;
  padding: 3px 8px; border-radius: 6px;
  background: rgba(34, 197, 94, 0.12);
  color: var(--good);
  border: 1px solid rgba(34, 197, 94, 0.35);
  font-size: .72rem; font-weight: 700; letter-spacing: .04em;
}
.pill.done { border-color: rgba(34, 197, 94, 0.4); color: var(--good); }
.card-reset {
  position: absolute; bottom: 10px; right: 10px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  color: var(--ink-2);
  font-size: .75rem;
  cursor: pointer;
  transition: all .12s;
}
.card-reset:hover { border-color: var(--accent); color: var(--ink); background: var(--card-2); }

/* -------- Mock exam timer + banner in exam view -------- */
.mock-timer {
  display: inline-flex; flex-direction: column; align-items: flex-start;
  padding: 8px 14px; margin-left: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  font-variant-numeric: tabular-nums;
}
.mock-timer-label { font-size: .68rem; letter-spacing: .1em; color: var(--muted); text-transform: uppercase; }
.mock-timer-val { font-size: 1.6rem; font-weight: 800; color: var(--ink); }
.mock-timer-val.urgent { color: var(--bad); }
.mock-notice {
  padding: 12px 14px; margin: 10px 0 18px;
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink-2); font-size: .9rem;
}
.mock-notice strong { color: var(--ink); }

/* -------- Flashcards -------- */
.flashcards { display: flex; flex-direction: column; gap: 14px; align-items: center; }
.fc-meta { color: var(--muted); font-size: .82rem; text-align: center; }
.fc-meta kbd {
  display: inline-block; padding: 1px 6px;
  border: 1px solid var(--border-2); border-radius: 4px;
  font-size: .75rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--ink-2); background: var(--card);
}
.fc-card {
  width: 100%; max-width: 640px; min-height: 280px;
  perspective: 1200px;
  cursor: pointer;
  outline: none;
}
.fc-card:focus-visible .fc-inner { box-shadow: 0 0 0 2px var(--accent); border-radius: 12px; }
.fc-inner {
  position: relative; width: 100%; min-height: 280px;
  transition: transform .45s cubic-bezier(.3,.8,.4,1);
  transform-style: preserve-3d;
}
.fc-card.flipped .fc-inner { transform: rotateY(180deg); }
.fc-face {
  position: absolute; inset: 0;
  padding: 28px 30px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  backface-visibility: hidden;
  display: flex; flex-direction: column; justify-content: center;
}
.fc-front { align-items: center; text-align: center; }
.fc-back { transform: rotateY(180deg); overflow-y: auto; }
.fc-section { color: var(--muted); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 14px; }
.fc-term { color: var(--ink); font-size: 1.6rem; font-weight: 700; line-height: 1.25; }
.fc-hint { color: var(--muted); font-size: .72rem; margin-top: 18px; letter-spacing: .06em; text-transform: uppercase; }
.fc-body { color: var(--ink); font-size: .98rem; line-height: 1.55; }
.fc-body strong { color: var(--ink); }
.fc-controls {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; max-width: 640px;
}
.fc-progress { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; min-width: 72px; text-align: center; }
.fc-session-progress { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; }

/* Header (progress ring + legend + reset) above the card */
.fc-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; width: 100%; max-width: 640px;
  padding: 12px 14px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  flex-wrap: wrap;
}
.fc-progress-ring {
  width: 60px; height: 60px; border-radius: 50%;
  background: var(--bg-2);
  border: 2px solid var(--border-2);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.fc-ring-label {
  display: flex; flex-direction: column; align-items: center;
  line-height: 1;
}
.fc-ring-label strong {
  color: var(--accent);
  font-size: 1.1rem; font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.fc-ring-label span {
  color: var(--muted); font-size: .7rem; margin-top: 2px;
}
.fc-legend {
  display: flex; flex-wrap: wrap; gap: 12px 18px;
  flex: 1; justify-content: center;
  font-size: .82rem; color: var(--ink-2);
}
.fc-legend > div { display: inline-flex; align-items: center; gap: 6px; }
.fc-legend strong { color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }
.fc-dot {
  display: inline-block; width: 10px; height: 10px; border-radius: 50%;
  background: var(--border-2);
}
.fc-dot-confident { background: var(--good, #22c55e); }
.fc-dot-good { background: var(--accent, #a78bfa); }
.fc-dot-weak { background: var(--bad, #dc2626); }
.fc-header-actions { flex-shrink: 0; }

/* Stage wraps the card so we can swap it for the "done" panel without
   yanking the whole flashcards flexbox. */
.fc-stage {
  width: 100%; max-width: 640px;
  display: flex; justify-content: center;
}

/* Rate row — three big buttons under the card */
.fc-rate-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 100%; max-width: 640px;
}
.fc-rate {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--ink);
  cursor: pointer;
  font-weight: 600;
  transition: transform .08s, border-color .12s, background .12s, opacity .12s;
}
.fc-rate:hover:not(:disabled) { transform: translateY(-1px); }
.fc-rate:disabled { opacity: .45; cursor: not-allowed; }
.fc-rate-ico {
  width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: .85rem; font-weight: 800;
  background: var(--bg-2);
  border: 1px solid var(--border-2);
}
.fc-rate-lbl { font-size: .92rem; }
.fc-rate-kbd {
  margin-left: auto;
  padding: 1px 6px; border-radius: 4px;
  border: 1px solid var(--border-2); background: var(--bg-2);
  color: var(--muted); font-size: .72rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.fc-rate-weak:hover:not(:disabled) { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 14%, var(--card-2)); }
.fc-rate-weak .fc-rate-ico { color: var(--bad); border-color: var(--bad); }
.fc-rate-good:hover:not(:disabled) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, var(--card-2)); }
.fc-rate-good .fc-rate-ico { color: var(--accent); border-color: var(--accent); }
.fc-rate-confident:hover:not(:disabled) { border-color: var(--good, #22c55e); background: color-mix(in srgb, var(--good, #22c55e) 14%, var(--card-2)); }
.fc-rate-confident .fc-rate-ico { color: var(--good, #22c55e); border-color: var(--good, #22c55e); }

/* Session-complete / deck-mastered panel */
.fc-done {
  width: 100%; max-width: 640px;
  padding: 34px 24px;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.fc-done-ico { font-size: 2.4rem; margin-bottom: 8px; }
.fc-done h3 { margin: 0 0 8px; font-size: 1.2rem; color: var(--ink); }
.fc-done p { margin: 0 auto 18px; max-width: 460px; color: var(--ink-2); font-size: .92rem; line-height: 1.5; }
.fc-done-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

@media (max-width: 600px) {
  .fc-rate-row { grid-template-columns: 1fr; }
  .fc-rate-kbd { display: none; }
}

/* Post-session understanding quiz (fires automatically when a flashcard
   session ends). Real exam questions drawn from the terms the user just
   rated — wrong answers demote the matching term back to Weak. */
.fc-quiz {
  width: 100%; max-width: 640px;
  padding: 20px 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  display: flex; flex-direction: column; gap: 14px;
}
.fc-quiz-head {
  display: flex; justify-content: space-between; align-items: center;
  gap: 10px; flex-wrap: wrap;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.fc-quiz-head-l { display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.fc-quiz-term { color: var(--ink-2); font-size: .85rem; }
.fc-quiz-term strong { color: var(--ink); }
.fc-quiz-prog {
  color: var(--muted); font-size: .78rem; letter-spacing: .06em;
  text-transform: uppercase; font-variant-numeric: tabular-nums;
}
.fc-quiz-q {
  color: var(--ink); font-size: 1.02rem; line-height: 1.55;
  font-weight: 500;
}
.fc-quiz-opts {
  display: flex; flex-direction: column; gap: 8px;
}
.fc-quiz-opt {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 10px 14px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: border-color .12s, background .12s, transform .08s;
  font-size: .94rem; line-height: 1.4;
}
.fc-quiz-opt:hover:not(:disabled) { border-color: var(--accent); transform: translateX(2px); }
.fc-quiz-opt:disabled { cursor: default; }
.fc-quiz-opt.locked { opacity: .9; }
.fc-quiz-opt.right {
  border-color: var(--good, #22c55e);
  background: color-mix(in srgb, var(--good, #22c55e) 14%, var(--card-2));
}
.fc-quiz-opt.wrong {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 14%, var(--card-2));
}
.fc-quiz-letter {
  flex-shrink: 0;
  width: 24px; height: 24px; border-radius: 6px;
  display: grid; place-items: center;
  background: var(--bg-2); border: 1px solid var(--border-2);
  font-size: .82rem; font-weight: 700; color: var(--muted);
}
.fc-quiz-opt.right .fc-quiz-letter { color: var(--good, #22c55e); border-color: var(--good, #22c55e); }
.fc-quiz-opt.wrong .fc-quiz-letter { color: var(--bad); border-color: var(--bad); }
.fc-quiz-text { flex: 1; }
.fc-quiz-verdict {
  padding: 10px 12px;
  border-radius: 8px;
  font-size: .9rem; line-height: 1.5;
  background: var(--card-2);
  border: 1px solid var(--border);
}
.fc-quiz-verdict.ok {
  border-color: var(--good, #22c55e);
  color: var(--ink);
  background: color-mix(in srgb, var(--good, #22c55e) 10%, var(--card-2));
}
.fc-quiz-verdict.bad {
  border-color: var(--bad);
  color: var(--ink);
  background: color-mix(in srgb, var(--bad) 10%, var(--card-2));
}
.fc-quiz-verdict em { color: var(--red-light); font-style: normal; font-weight: 600; }
.fc-quiz-nav {
  display: flex; justify-content: flex-end;
}
.fc-quiz-nav .hidden { display: none; }

/* Quiz recap line inside the Session-complete / Deck-mastered panel */
.fc-quiz-recap {
  margin: -8px auto 16px;
  padding: 8px 14px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: inline-block;
  font-size: .88rem;
  color: var(--ink-2);
}
.fc-quiz-recap strong { color: var(--ink); }
.fc-quiz-recap-weak { color: var(--bad); font-weight: 600; }

/* -------- Streak panel on stats page -------- */
.streak-panel { margin-bottom: 18px; }
.streak-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.streak-stats { display: flex; gap: 22px; }
.streak-stats > div { display: flex; flex-direction: column; align-items: flex-end; }
.streak-big { font-size: 1.6rem; font-weight: 800; color: var(--ink); line-height: 1; }
.streak-sub { font-size: .72rem; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; margin-top: 4px; }
.streak-today { margin: 16px 0 14px; padding: 12px 14px; background: var(--card-2); border: 1px solid var(--border); border-radius: 8px; }
.streak-today-done { color: var(--good); font-weight: 600; }
.streak-today-empty { color: var(--ink-2); }
.streak-today-empty a { color: var(--accent); }
.streak-prog-text { color: var(--ink-2); font-size: .9rem; margin-bottom: 8px; }
.streak-prog-bar { height: 6px; background: var(--bg-2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.streak-prog-bar span { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.streak-heatmap { display: grid; grid-template-columns: repeat(30, 1fr); gap: 4px; margin-top: 10px; }
.hm-cell {
  height: 18px;
  border-radius: 3px;
  background: var(--card-2);
  border: 1px solid var(--border);
}
.hm-cell.partial { background: rgba(167, 139, 250, 0.25); border-color: rgba(167, 139, 250, 0.4); }
.hm-cell.met { background: var(--accent); border-color: var(--accent); }

/* Small buttons used in home + flashcards */
.btn.small { padding: 4px 10px; font-size: .82rem; }

/* -------- AI tutor: FAB + chat panel -------- */
.tutor-fab {
  position: fixed; right: 22px; bottom: 22px; z-index: 40;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 18px;
  background: var(--accent); color: #0a0a0a;
  border: none; border-radius: 999px;
  font-size: .92rem; font-weight: 700; letter-spacing: .02em;
  cursor: pointer;
  box-shadow: 0 8px 24px -8px rgba(167, 139, 250, 0.5);
  transition: transform .12s, box-shadow .12s;
}
.tutor-fab:hover { transform: translateY(-1px); box-shadow: 0 12px 28px -8px rgba(167, 139, 250, 0.6); }
.tutor-fab-ico { font-size: 1.05em; }

.tutor-panel {
  position: fixed; right: 22px; bottom: 88px; z-index: 41;
  width: min(420px, calc(100vw - 44px));
  max-height: min(640px, calc(100vh - 120px));
  display: flex; flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.7);
  overflow: hidden;
}
.tutor-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 14px; border-bottom: 1px solid var(--border);
}
.tutor-head strong { color: var(--ink); font-size: 1rem; }
.tutor-topic { color: var(--muted); font-size: .82rem; margin-left: 8px; }
.tutor-close {
  background: transparent; border: none; color: var(--muted);
  font-size: 1.4rem; line-height: 1; cursor: pointer;
  padding: 2px 6px; border-radius: 4px;
}
.tutor-close:hover { color: var(--ink); background: var(--card-2); }

.tutor-budget { padding: 8px 14px; border-bottom: 1px solid var(--border); background: var(--card-2); }
.tutor-budget-bar {
  height: 4px; background: var(--bg-2); border-radius: 99px; overflow: hidden;
  margin-bottom: 4px;
}
.tutor-budget-bar span { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.tutor-budget-text { font-size: .72rem; color: var(--muted); font-variant-numeric: tabular-nums; }

.tutor-body {
  flex: 1; overflow-y: auto;
  padding: 14px;
  display: flex; flex-direction: column; gap: 10px;
  min-height: 180px;
}
.tutor-empty { color: var(--muted); font-size: .88rem; line-height: 1.5; }
.tutor-msg { display: flex; }
.tutor-msg-user { justify-content: flex-end; }
.tutor-msg-assistant { justify-content: flex-start; }
.tutor-msg-bubble {
  max-width: 88%;
  padding: 9px 12px;
  border-radius: 10px;
  font-size: .9rem; line-height: 1.5;
  word-wrap: break-word;
}
.tutor-msg-user .tutor-msg-bubble {
  background: var(--accent); color: #0a0a0a;
  border-bottom-right-radius: 3px;
}
.tutor-msg-assistant .tutor-msg-bubble {
  background: var(--card-2); color: var(--ink);
  border: 1px solid var(--border);
  border-bottom-left-radius: 3px;
}
.tutor-msg-bubble strong { color: inherit; font-weight: 700; }
.tutor-msg-bubble code {
  padding: 1px 5px; border-radius: 3px;
  background: rgba(255,255,255,0.06); font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .88em;
}

.tutor-typing { display: inline-flex; gap: 4px; padding: 12px 14px; }
.tutor-typing span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--muted);
  animation: tutor-pulse 1.2s infinite ease-in-out;
}
.tutor-typing span:nth-child(2) { animation-delay: .15s; }
.tutor-typing span:nth-child(3) { animation-delay: .3s; }
@keyframes tutor-pulse {
  0%, 80%, 100% { opacity: .3; transform: scale(.8); }
  40% { opacity: 1; transform: scale(1); }
}

.tutor-suggested {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 0 14px 10px;
}
.tutor-chip {
  padding: 5px 10px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink-2);
  font-size: .78rem;
  cursor: pointer;
}
.tutor-chip:hover { border-color: var(--accent); color: var(--ink); }

.tutor-form {
  display: flex; gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--border);
  background: var(--card);
}
.tutor-form textarea {
  flex: 1; resize: none;
  padding: 8px 10px;
  background: var(--bg-2); color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: inherit; font-size: .9rem; line-height: 1.4;
}
.tutor-form textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.tutor-form textarea:disabled { opacity: .5; cursor: not-allowed; }
.tutor-cap-notice {
  padding: 8px 14px; font-size: .82rem; color: var(--bad);
  background: var(--card-2); border-top: 1px solid var(--border);
}

/* ---- Leaderboard ---- */
.lb-podium {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 12px; margin: 8px 0 20px;
}
.lb-podium-card {
  background: var(--card-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 18px 14px; text-align: center;
  position: relative; transition: transform .15s ease, border-color .15s ease;
}
.lb-podium-card:hover { transform: translateY(-2px); }
.lb-rank-1 { border-color: #d4af37; box-shadow: 0 0 0 1px #d4af3733 inset; }
.lb-rank-2 { border-color: #b8b8b8; }
.lb-rank-3 { border-color: #b0724a; }
.lb-podium-card.is-me { outline: 2px solid var(--red); outline-offset: 2px; }
.lb-medal { font-size: 1.8rem; line-height: 1; margin-bottom: 6px; }
.lb-podium-card .lb-user {
  font-weight: 700; color: var(--ink); font-size: 1.05rem;
  word-break: break-word; margin-bottom: 6px;
}
.lb-podium-card .lb-score {
  font-size: 1.6rem; font-weight: 800; color: var(--red);
  font-variant-numeric: tabular-nums;
}
.lb-podium-card .lb-sub { color: var(--muted); font-size: .8rem; margin-top: 4px; }
.lb-table tbody tr.lb-me {
  background: color-mix(in srgb, var(--red) 18%, transparent);
}
.lb-table tbody tr.lb-me td { border-color: var(--red); }
.lb-you {
  padding: 10px 14px; background: var(--card-2);
  border: 1px solid var(--border); border-radius: 8px;
  color: var(--muted); font-size: .88rem;
}
.lb-you strong { color: var(--ink); }
@media (max-width: 640px) {
  .lb-podium { grid-template-columns: 1fr; }
}

/* ICDC countdown pill (topbar) */
.icdc-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; margin-right: 6px;
  background: var(--card-2); border: 1px solid var(--border);
  border-radius: 999px; font-size: .8rem; color: var(--ink);
  font-variant-numeric: tabular-nums; white-space: nowrap;
}
.icdc-pill .icdc-ico { opacity: .85; }
.icdc-pill strong { color: var(--red-light); font-weight: 700; }
.icdc-pill.urgent { border-color: var(--red); }
.icdc-pill.urgent strong { color: #fff; }
@media (max-width: 760px) {
  .icdc-pill .icdc-txt { font-size: .75rem; }
}

/* ================================================================
   AI Tutor panel (Study tab) — chat card with composer
   Design language: shadcn-ish dark card, gradient star avatar,
   colored action chips, live char counter, budget bar.
   ================================================================ */
.study-tutor-wrap { width: 100%; }
.st-card {
  display: flex; flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(255,255,255,.02) inset, 0 8px 24px rgba(0,0,0,.35);
}
.st-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(167,139,250,.06), transparent);
}
.st-head-left { display: flex; align-items: center; gap: 8px; font-size: .9rem; color: var(--ink); }
.st-head-left strong { font-weight: 600; }
.st-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 3px rgba(34,197,94,.15);
  animation: stPulse 2s ease-in-out infinite;
}
@keyframes stPulse { 50% { box-shadow: 0 0 0 6px rgba(34,197,94,0); } }
.st-topic {
  font-size: .78rem; color: var(--ink-2);
  padding: 2px 8px; border-radius: 6px;
  background: var(--card-2); border: 1px solid var(--border);
}
.st-budget { display: flex; align-items: center; gap: 10px; }
.st-budget-bar {
  width: 80px; height: 6px; border-radius: 3px;
  background: var(--border); overflow: hidden;
}
.st-budget-bar span {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--red-light), var(--red));
  transition: width .3s ease;
}
.st-budget-text { font-size: .72rem; color: var(--muted); font-variant-numeric: tabular-nums; }

/* Body — chat messages */
.st-body {
  flex: 1;
  min-height: 320px;
  max-height: 560px;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex; flex-direction: column; gap: 14px;
  scroll-behavior: smooth;
}
.st-body::-webkit-scrollbar { width: 8px; }
.st-body::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 4px; }

/* Welcome / empty state */
.st-welcome {
  margin: auto; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  padding: 24px 16px;
}
.st-logo { filter: drop-shadow(0 6px 20px rgba(167,139,250,.25)); }
.st-welcome-text h4 { margin: 0; font-size: 1.05rem; font-weight: 500; color: var(--ink-2); }
.st-welcome-text h3 { margin: 2px 0 6px; font-size: 1.15rem; font-weight: 600; color: var(--ink); letter-spacing: -.01em; }
.st-welcome-text p { margin: 0; font-size: .86rem; color: var(--muted); max-width: 380px; line-height: 1.5; }

/* Messages */
.st-msg { display: flex; gap: 10px; align-items: flex-start; }
.st-msg-user { flex-direction: row-reverse; }
.st-avatar {
  flex-shrink: 0;
  width: 30px; height: 30px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem; font-weight: 600;
}
.st-avatar-ai {
  background: linear-gradient(135deg, #c4b5fd, #6d28d9);
  color: #fff;
  box-shadow: 0 2px 8px rgba(139,92,246,.35);
}
.st-avatar-user {
  background: var(--card-2);
  color: var(--ink);
  border: 1px solid var(--border);
}
.st-bubble {
  max-width: 78%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: .9rem;
  line-height: 1.55;
  color: var(--ink);
  word-wrap: break-word;
}
.st-msg-assistant .st-bubble {
  background: var(--card-2);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}
.st-msg-user .st-bubble {
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  color: #fff;
  border-top-right-radius: 4px;
}
.st-bubble strong { font-weight: 600; color: var(--ink); }
.st-msg-user .st-bubble strong { color: #fff; }
.st-bubble code {
  background: rgba(167,139,250,.15);
  color: var(--red-light);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: .84em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.st-bubble ul, .st-bubble ol { margin: 6px 0; padding-left: 20px; }
.st-bubble li { margin: 3px 0; }
.st-bubble p { margin: 6px 0; }
.st-bubble p:first-child { margin-top: 0; }
.st-bubble p:last-child { margin-bottom: 0; }

/* Typing indicator */
.st-typing { display: inline-flex; gap: 4px; padding: 14px 16px; }
.st-typing span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ink-2);
  animation: stBounce 1.2s infinite ease-in-out;
}
.st-typing span:nth-child(2) { animation-delay: .15s; }
.st-typing span:nth-child(3) { animation-delay: .3s; }
@keyframes stBounce { 0%, 60%, 100% { opacity: .3; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-3px); } }

/* Quick-action chips */
.st-chips {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: rgba(255,255,255,.01);
}
.st-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  font-size: .76rem; font-weight: 500;
  color: var(--ink-2);
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s ease;
}
.st-chip:hover {
  color: var(--ink);
  border-color: var(--border-2);
  background: #1a1a1a;
}
.st-chip-dot {
  width: 6px; height: 6px; border-radius: 50%;
  flex-shrink: 0;
}

/* Composer */
.st-form { padding: 10px 12px 12px; }
.st-composer {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-2);
  overflow: hidden;
  transition: border-color .15s ease;
}
.st-composer:focus-within { border-color: var(--red); box-shadow: 0 0 0 3px rgba(167,139,250,.12); }
.st-composer textarea {
  width: 100%;
  border: none; outline: none;
  background: transparent;
  padding: 12px 14px;
  font-family: inherit;
  font-size: .9rem;
  color: var(--ink);
  resize: none;
  min-height: 60px;
  max-height: 180px;
}
.st-composer textarea::placeholder { color: var(--muted); }
.st-composer textarea:disabled { opacity: .5; cursor: not-allowed; }
.st-composer-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 10px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.25);
}
.st-model-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px;
  font-size: .72rem; color: var(--ink-2);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 5px;
}
.st-model-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--red-light);
  box-shadow: 0 0 6px var(--red);
}
.st-composer-right { display: flex; align-items: center; gap: 10px; }
.st-charcount {
  font-size: .7rem; font-variant-numeric: tabular-nums;
  color: var(--muted);
  transition: color .15s ease;
}
.st-charcount-warn { color: #fbbf24; }
.st-charcount-over { color: var(--bad); font-weight: 600; }
.st-send {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  font-size: .8rem; font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s ease;
}
.st-send:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(139,92,246,.35); }
.st-send:disabled { opacity: .5; cursor: not-allowed; }
.st-send svg { flex-shrink: 0; }

.st-cap {
  margin: 8px 16px 12px;
  padding: 10px 12px;
  font-size: .82rem;
  color: var(--bad);
  background: rgba(239,68,68,.08);
  border: 1px solid rgba(239,68,68,.25);
  border-radius: 8px;
}

/* Mobile */
@media (max-width: 760px) {
  .st-head { padding: 10px 12px; }
  .st-budget-bar { width: 50px; }
  .st-body { padding: 14px 12px; max-height: 50vh; }
  .st-bubble { max-width: 85%; font-size: .88rem; }
  .st-chips { padding: 8px 12px; }
  .st-chip { font-size: .72rem; padding: 4px 8px; }
  .st-composer textarea { font-size: .88rem; }
}

/* Tutor lesson-plan checklist */
.st-plan {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(167,139,250,.04), transparent);
}
.st-plan summary {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  cursor: pointer;
  list-style: none;
  font-size: .82rem;
  color: var(--ink-2);
}
.st-plan summary::-webkit-details-marker { display: none; }
.st-plan summary::after {
  content: "▾";
  font-size: .7rem;
  color: var(--muted);
  transition: transform .2s ease;
  margin-left: auto;
}
.st-plan[open] summary::after { transform: rotate(180deg); }
.st-plan-label { font-weight: 600; color: var(--ink); }
.st-plan-progress {
  font-size: .74rem; color: var(--muted);
  font-variant-numeric: tabular-nums;
  padding: 2px 8px; border-radius: 5px;
  background: var(--card-2); border: 1px solid var(--border);
}
.st-plan-barwrap {
  flex: 1; max-width: 160px;
  height: 4px; border-radius: 2px;
  background: var(--border); overflow: hidden;
}
.st-plan-bar {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--red-light), var(--red));
  transition: width .4s ease;
}
.st-plan-list {
  margin: 0; padding: 4px 16px 14px;
  list-style: none;
  max-height: 220px;
  overflow-y: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 16px;
}
.st-plan-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 0;
  font-size: .8rem;
  color: var(--ink-2);
  line-height: 1.3;
}
.st-plan-list li.done { color: var(--muted); }
.st-plan-list li.done .st-plan-name { text-decoration: line-through; text-decoration-color: rgba(113,113,122,.5); }
.st-plan-check {
  flex-shrink: 0;
  width: 16px; height: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem; font-weight: 700;
  border-radius: 4px;
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--muted);
}
.st-plan-list li.done .st-plan-check {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}
@media (max-width: 760px) {
  .st-plan-list { grid-template-columns: 1fr; max-height: 160px; }
  .st-plan-barwrap { display: none; }
}

/* Leaderboard window tabs */
.lb-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  margin-bottom: 12px;
}
.lb-window-tabs {
  display: inline-flex;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
}
.lb-tab {
  padding: 5px 11px;
  font-size: .78rem; font-weight: 500;
  color: var(--ink-2);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all .12s ease;
}
.lb-tab:hover { color: var(--ink); }
.lb-tab.active {
  color: #fff;
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  box-shadow: 0 2px 6px rgba(139,92,246,.3);
}
@media (max-width: 760px) {
  .lb-window-tabs { width: 100%; justify-content: space-between; }
  .lb-tab { flex: 1; padding: 6px 4px; font-size: .72rem; }
}

/* ============================================================
   ICDC Countdown page — reached via the topbar ICDC pill.
   Big ticking D/H/M/S + animated skyblue grid (ported from the
   21st.dev counter-loader styled-components component).
   ============================================================ */
.countdown-page {
  position: relative;
  min-height: calc(100vh - 80px);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background: radial-gradient(ellipse at top, #1a0d3d 0%, #0a0714 60%, #050208 100%);
  border-radius: 18px;
}
.countdown-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.cd-orb {
  position: absolute; border-radius: 50%; filter: blur(90px);
  opacity: 0.38; animation: cd-float 12s ease-in-out infinite;
}
.cd-orb-1 { width: 420px; height: 420px; background: #6d28d9; top: -100px; left: -80px; }
.cd-orb-2 { width: 320px; height: 320px; background: #4c1d95; bottom: -80px; right: -60px; animation-delay: -4s; }
.cd-orb-3 { width: 260px; height: 260px; background: #8b5cf6; top: 40%; right: 20%; animation-delay: -8s; opacity: 0.28; }
@keyframes cd-float {
  0%,100% { transform: translate(0,0) scale(1); }
  50%     { transform: translate(30px,-40px) scale(1.1); }
}

.countdown-inner {
  position: relative; z-index: 2;
  max-width: 920px; width: 100%;
  text-align: center;
  color: #fff;
}
.countdown-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(167,139,250,0.3);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 600;
  color: #ddd6fe;
  backdrop-filter: blur(8px);
}
.cd-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #a78bfa;
  box-shadow: 0 0 8px rgba(167, 139, 250, 0.5);
  animation: cd-pulse 1.5s ease-in-out infinite;
}
@keyframes cd-pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50%     { opacity: 0.5; transform: scale(0.85); }
}
.countdown-title {
  margin: 28px 0 36px;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #fff 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.countdown-grid {
  display: inline-flex; align-items: flex-start; gap: clamp(6px, 2vw, 20px);
  padding: 28px 32px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.01) 100%);
  border: 1px solid rgba(167,139,250,0.25);
  box-shadow:
    0 0 0 1px rgba(167,139,250,0.08),
    0 30px 80px -20px rgba(91,33,182,0.5),
    inset 0 1px 0 rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
}
.cd-unit { display: flex; flex-direction: column; align-items: center; min-width: clamp(64px, 13vw, 120px); }
.cd-num {
  font-size: clamp(2.8rem, 8vw, 5.2rem);
  font-weight: 900;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: #fff;
  background: linear-gradient(180deg, #f5f3ff 0%, #c4b5fd 55%, #7c3aed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 30px rgba(124,58,237,0.4);
  transition: transform 0.18s cubic-bezier(0.25, 1, 0.5, 1);
}
.cd-num-seconds.cd-tick { animation: cd-tick 0.5s ease-out; }
@keyframes cd-tick {
  0%   { transform: scale(1.12); filter: brightness(1.3); }
  100% { transform: scale(1);    filter: brightness(1);   }
}
.cd-lbl {
  margin-top: 12px;
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(196,181,253,0.75);
  font-weight: 700;
}
.cd-sep {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  color: rgba(167,139,250,0.4);
  line-height: 1;
  padding-top: clamp(6px, 1.5vw, 14px);
  animation: cd-sep-blink 1s ease-in-out infinite;
}
@keyframes cd-sep-blink {
  0%,100% { opacity: 0.25; }
  50%     { opacity: 0.8; }
}
.countdown-target {
  margin-top: 24px;
  font-size: 0.9rem;
  color: rgba(221,214,254,0.7);
  letter-spacing: 0.05em;
}
.countdown-cta-row {
  margin-top: 36px;
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ---- word-morph loader (DECA ↔ ICDC in block letters) ----
   Grid built in JS: 15 cols × 5 rows. Each cell is a small rounded
   square that fades between on/off state when the word changes,
   with a per-column delay so the transition feels like a sweep. */
.word-loader {
  margin: 40px auto 0;
  display: flex; justify-content: center; align-items: center;
  min-height: 120px;
}
.word-loader .wl-grid {
  --wl-cell: 16px;
  --wl-gap: 6px;
  --wl-cols: 15;
  display: grid;
  grid-template-columns: repeat(var(--wl-cols), var(--wl-cell));
  grid-template-rows: repeat(5, var(--wl-cell));
  gap: var(--wl-gap);
}
.word-loader .wl-cell {
  width: var(--wl-cell);
  height: var(--wl-cell);
  border-radius: 4px;
  background: transparent;
  box-shadow: none;
  transform: scale(.55);
  opacity: 0;
  transition:
    transform .45s cubic-bezier(.2,.8,.2,1),
    opacity   .45s ease,
    background-color .45s ease,
    box-shadow .45s ease;
}
.word-loader .wl-cell.on {
  background: #a78bfa;
  box-shadow: 0 0 8px rgba(167, 139, 250, 0.4);
  transform: scale(1);
  opacity: 1;
}
@media (max-width: 640px) {
  .word-loader .wl-grid { --wl-cell: 11px; --wl-gap: 4px; }
}

/* Make the topbar ICDC pill feel clickable. */
a.icdc-pill { cursor: pointer; text-decoration: none; }
a.icdc-pill:hover { filter: brightness(1.15); transform: translateY(-1px); }

@media (max-width: 640px) {
  .countdown-grid { padding: 18px 14px; gap: 4px; }
  .cd-lbl { font-size: 0.6rem; letter-spacing: 0.18em; }
}

/* ================================================================
   QUESTION BANK — dark theme, matches the rest of the app
   ================================================================ */
.qbank-page {
  max-width: 1100px;
  margin: 18px auto 60px;
  padding: 0 20px;
  color: var(--ink);
}
.qbank-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.qbank-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.22) 0%, rgba(91, 33, 182, 0.32) 100%);
  color: var(--red-light);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid var(--border-2);
  box-shadow: 0 4px 14px rgba(76, 29, 149, 0.18);
}
.qbank-head h2 { margin: 0 0 4px; font-size: 1.55rem; color: var(--ink); }
.qbank-head .hint { margin: 0; max-width: 680px; color: var(--ink-2); }

/* Mode tabs — Questions vs Mega Flashcards */
.qbank-mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}
.qbank-mode-tab {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  cursor: pointer;
  color: var(--ink-2);
  text-align: left;
  transition: border-color .15s, background .15s, color .15s, transform .08s;
}
.qbank-mode-tab:hover { background: var(--card-2); color: var(--ink); }
.qbank-mode-tab.active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.22) 0%, rgba(91, 33, 182, 0.22) 100%);
  border-color: var(--red-light);
  color: var(--ink);
  box-shadow: 0 4px 14px rgba(76, 29, 149, 0.18);
}
.qbank-mode-tab .qbmt-ico { font-size: 1.1rem; }
.qbank-mode-tab .qbmt-lbl {
  display: inline-block;
  margin-right: 8px;
  font-weight: 700;
  font-size: 1rem;
}
.qbank-mode-tab .qbmt-sub {
  font-size: .82rem;
  color: var(--muted);
  font-weight: 500;
}
.qbank-mode-tab.active .qbmt-sub { color: var(--ink-2); }
@media (max-width: 640px) {
  .qbank-mode-tabs { grid-template-columns: 1fr; }
}

/* Flashcard-mode filter panel: topic chips fill full width + action row */
.qbank-filters.flashmode { display: block; }
.qbank-filters.flashmode .qbank-filter-group { margin-bottom: 10px; }
.qbank-flash-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

/* Mega flashcard shell */
.mega-fc {
  margin-top: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 22px;
}
.mega-fc-head { margin-bottom: 10px; }
.mega-fc-head h3 { margin: 0 0 4px; font-size: 1.1rem; color: var(--ink); }
.mega-fc-head .hint { margin: 0; color: var(--ink-2); font-size: .9rem; }

/* Topic-prefix badge on the card face */
.mfc-topic-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  background: rgba(139, 92, 246, 0.18);
  color: var(--red-light);
  border: 1px solid var(--red-light);
  margin-right: 6px;
  vertical-align: middle;
}

.qbank-toggle-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  padding: 10px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: none;
}
.qb-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  font-size: .9rem;
  color: var(--ink);
  padding: 6px 10px;
  border-radius: 999px;
  transition: background .15s;
}
.qb-toggle:hover { background: var(--card-2); }
.qb-toggle input[type="checkbox"] {
  appearance: none;
  width: 36px;
  height: 20px;
  border-radius: 999px;
  background: var(--border-2);
  position: relative;
  cursor: pointer;
  transition: background .2s;
  margin: 0;
}
.qb-toggle input[type="checkbox"]:checked {
  background: linear-gradient(135deg, var(--red-dark) 0%, var(--red-light) 100%);
}
.qb-toggle input[type="checkbox"]::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  transition: transform .2s;
  box-shadow: 0 1px 3px rgba(0,0,0,.4);
}
.qb-toggle input[type="checkbox"]:checked::after {
  transform: translateX(16px);
}
.qb-toggle-label { font-weight: 500; color: var(--ink); }
.qbank-count {
  margin-left: auto;
  color: var(--muted);
  font-size: .88rem;
  font-weight: 600;
}

.qbank-filters {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 18px;
  box-shadow: none;
}
.qbank-filter-group { margin-bottom: 12px; }
.qbank-filter-group:last-of-type { margin-bottom: 6px; }
.qbank-filter-label {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--muted);
  margin-bottom: 6px;
}
.qb-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.qb-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card-2);
  font-size: .85rem;
  font-weight: 500;
  color: var(--ink-2);
  cursor: pointer;
  transition: all .15s;
}
.qb-chip:hover {
  border-color: var(--red-light);
  background: rgba(167, 139, 250, 0.12);
  color: var(--ink);
}
.qb-chip.active {
  background: rgba(139, 92, 246, 0.20);
  border-color: var(--red);
  color: var(--red-light);
  font-weight: 600;
}
.qb-chip-code {
  font-family: ui-monospace, monospace;
  font-size: .78rem;
  font-weight: 700;
  color: var(--red-light);
  background: rgba(167, 139, 250, 0.08);
  border: 1px solid var(--border-2);
  padding: 1px 5px;
  border-radius: 4px;
}
.qb-chip.active .qb-chip-code {
  background: rgba(167, 139, 250, 0.22);
  border-color: var(--red);
  color: #fff;
}
.qb-chip-name { line-height: 1.2; }
.qb-chip-count {
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 600;
}
.qb-chip.active .qb-chip-count { color: var(--red-light); }
.qb-chips-topics { max-height: 180px; overflow-y: auto; padding-right: 4px; }
.qb-chips-topics::-webkit-scrollbar { width: 6px; }
.qb-chips-topics::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }

.qb-clear {
  margin-top: 8px;
  font-size: .82rem;
  padding: 4px 10px;
  color: var(--bad);
  border: 1px solid var(--border-2);
  background: transparent;
  border-radius: 6px;
  cursor: pointer;
}
.qb-clear:hover {
  background: rgba(220, 38, 38, 0.10);
  color: #fca5a5;
  border-color: rgba(220, 38, 38, 0.45);
}

.qbank-list { margin-top: 6px; }
.qbank-list .q-card,
.qbank-list .sq-card,
.qbank-list .study-q {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--ink);
}
.qbank-loadmore-wrap {
  text-align: center;
  margin-top: 18px;
}

/* Generic input/select inside Question Bank filters (search bars etc.) */
.qbank-filters input[type="search"],
.qbank-filters input[type="text"],
.qbank-filters select {
  background: var(--card-2);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
}
.qbank-filters input[type="search"]::placeholder,
.qbank-filters input[type="text"]::placeholder {
  color: var(--muted);
}